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/*
* Copyright (C) 2011, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_WAVE_SHAPER_DSP_KERNEL_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_WAVE_SHAPER_DSP_KERNEL_H_
#include <memory>
#include "third_party/blink/renderer/modules/webaudio/wave_shaper_processor.h"
#include "third_party/blink/renderer/platform/audio/audio_array.h"
#include "third_party/blink/renderer/platform/audio/audio_dsp_kernel.h"
#include "third_party/blink/renderer/platform/audio/down_sampler.h"
#include "third_party/blink/renderer/platform/audio/up_sampler.h"
namespace blink {
class WaveShaperProcessor;
// WaveShaperDSPKernel is an AudioDSPKernel and is responsible for non-linear
// distortion on one channel.
class WaveShaperDSPKernel final : public AudioDSPKernel {
public:
explicit WaveShaperDSPKernel(WaveShaperProcessor*);
// AudioDSPKernel
void Process(const float* source,
float* dest,
uint32_t frames_to_process) override;
void Reset() override;
double TailTime() const override;
double LatencyTime() const override;
bool RequiresTailProcessing() const final;
// Oversampling requires more resources, so let's only allocate them if
// needed.
void LazyInitializeOversampling();
// Computes value of the WaveShaper
double WaveShaperCurveValue(float input,
const float* curve_data,
int curve_length) const;
// Like WaveShaperCurveValue, but computes the values for a vector of inputs.
void WaveShaperCurveValues(float* destination,
const float* input,
uint32_t frames_to_process,
const float* curve_data,
int curve_length) const;
// Set the tail time
void SetTailTime(double time) { tail_time_ = time; }
protected:
// Apply the shaping curve.
void ProcessCurve(const float* source,
float* dest,
uint32_t frames_to_process);
// Use up-sampling, process at the higher sample-rate, then down-sample.
void ProcessCurve2x(const float* source,
float* dest,
uint32_t frames_to_process);
void ProcessCurve4x(const float* source,
float* dest,
uint32_t frames_to_process);
WaveShaperProcessor* GetWaveShaperProcessor() {
return static_cast<WaveShaperProcessor*>(Processor());
}
// Oversampling.
std::unique_ptr<AudioFloatArray> temp_buffer_;
std::unique_ptr<AudioFloatArray> temp_buffer2_;
std::unique_ptr<UpSampler> up_sampler_;
std::unique_ptr<DownSampler> down_sampler_;
std::unique_ptr<UpSampler> up_sampler2_;
std::unique_ptr<DownSampler> down_sampler2_;
private:
// Tail time for the WaveShaper. This basically can have two values: 0 and
// infinity. It only takes the value of infinity if the wave shaper curve is
// such that a zero input produces a non-zero output. In this case, the node
// has an infinite tail so that silent input continues to produce non-silent
// output.
double tail_time_;
// Work arrays needed by WaveShaperCurveValues(). Mutable so this
// const function can modify these arrays. There's no state or
// anything kept here. See WaveShaperCurveValues() for details on
// what these hold.
mutable AudioFloatArray virtual_index_;
mutable AudioFloatArray index_;
mutable AudioFloatArray v1_;
mutable AudioFloatArray v2_;
mutable AudioFloatArray f_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_WAVE_SHAPER_DSP_KERNEL_H_
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